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    Odd have to see which ones they were, that horn...

    Odd have to see which ones they were, that horn could be set-up for a 1" driver different throat. Any of the modern large format driver like the 2450SL, 2451/2452 should work just as well as the...
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    Why would you have to rescale the horn? All you...

    Why would you have to rescale the horn? All you are changing is the throat. You could just rescale the throat and leave the horn be as they are separate in the original design. You would also need to...
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    Hello Toddalin That's why it's best to try...

    Hello Toddalin



    That's why it's best to try on a simple 2 way system to see. When I built my CC L250 Jubilees and 1400 Be Arrays it got very costly compared to a standard network.

    Rob:)
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    Yes The 2" throats had a decades old...

    Yes



    The 2" throats had a decades old flare rate. The new throatless design is actually supposed to reduce distortion. There is a Technote about it
    ...
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    They are identical difference being throated vs....

    They are identical difference being throated vs. throatless. Drivers like the 2450 vs 2451 are a perfect example same phase plug the 2450 has the typical throat with a recessed screen. On the 2451...
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    Hello Derek It's 250 per channel? If so no...

    Hello Derek

    It's 250 per channel? If so no problem they will be just fine. I use a pair as subs for my mains in my HT using a Crown PS-400 @ 200 per channel. I know they recommend minimum of 200...
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    The K145 and E145 are short coil log gap so the...

    The K145 and E145 are short coil log gap so the coil is 100% in the gap even at extremes. The E has significantly longer xmax about a 3rd more. You are going to end up with a very thick top plate and...
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    I use 3/4" fiberglass acoustic sealing tiles. ...

    I use 3/4" fiberglass acoustic sealing tiles.

    Rob:)
  9. Have you called JBL Technical services? Or gone...

    Have you called JBL Technical services? Or gone through the trouble shooting guide in the manual?

    Rob:)
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    As always great work! Rob:)

    As always great work!

    Rob:)
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    I should probably replace mine as well! Rob:)

    I should probably replace mine as well!

    Rob:)
  12. Replies
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    Hello Grumpy I tend to agree. If you look at...

    Hello Grumpy

    I tend to agree. If you look at it as AC vs DC the AC is high passed through the caps while the DC is blocked. Capacitors will discharge the DC through a ground at a rate of C X R =...
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    Hello Kay Well here is what GT thinks on...

    Hello Kay



    Well here is what GT thinks on that point.



    So I would try it before just blowing it off based on any pretense of superior capacitor quality. Some of the JBL CC networks use...
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    Try it in a simple 2 way design like an L20t3 or...

    Try it in a simple 2 way design like an L20t3 or 4406 and decide for yourself.

    http://www.audioheritage.org/vbulletin/showthread.php?3555-Bypassed-and-Biased-Capacitors


    Rob:)
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    What you may not realize is that system came out...

    What you may not realize is that system came out 3 years before the first CD player in 1982. So 1979 40 years ago. There is a big difference between the low end on a typical Vinyl record which was...
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    JMHO but what I'm seeing in some of these videos...

    JMHO but what I'm seeing in some of these videos is blatant abuse. You should never run drivers that hard especially vintage ones where parts are scarce or unobtanium. Get a sub if you want to run...
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    H's Rob:)

    H's

    Rob:)
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    ~ 10 grams of mass added via aquaplas on the rear...

    ~ 10 grams of mass added via aquaplas on the rear of the cone reducing Fs to ~ 28 Hz along with a modified edge treatment on the cloth surround. Well controlled and very consistent with very good...
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    The difference between a 2216Nd and a -1 is...

    The difference between a 2216Nd and a -1 is aquaplas added to the -1 so a 2216 is a 2234 vs a -1 2235 as an example.

    Rob:)
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    Yes they do. Are you using for HT or Music? For...

    Yes they do. Are you using for HT or Music? For HT they can run into trouble on some material. Mass rings slap the pole piece.

    Rob:)
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    Why don't you report the activity to the FBI?...

    Why don't you report the activity to the FBI? Might help them judge the scope of activity on the net. At least tell John and Ann. Especially if it is happening elsewhere. Also the Host not the Forum...
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    I might have to eat a little crow there. I just...

    I might have to eat a little crow there. I just took a look at them compared to Le-14A's. It very well could be aquaplas but the application looks different. Where the 14's are smooth and uniform the...
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    Both of the 128h-1 I have don't have aquaplas on...

    Both of the 128h-1 I have don't have aquaplas on them. They have a very ruff coating on the back of the cone almost like papermachte

    Rob:)
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    Hello Derek From the other side of the fence...

    Hello Derek

    From the other side of the fence it takes a significant change in mass to have a appreciable difference in FS. A coat of non loaded pigment only paint won't do it. There is a 30 gram...
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    Hello Steve I would just go with locally...

    Hello Steve

    I would just go with locally sourced wire and be done with it. As far as platting on the wire I have used both silver and tin lead. Tin lead will probably be scarce with RHOS. You...
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